TY - JOUR
T1 - Anisotropic magnetic excitations from single-chirality antiferromagnetic state in Ca-kapellasite
AU - Ihara, Y.
AU - Yoshida, H.
AU - Arashima, K.
AU - Hirata, Michihiro
AU - Sasaki, T.
N1 - Publisher Copyright:
© 2020 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.
PY - 2020/6
Y1 - 2020/6
N2 - We present a Cl35 NMR study for the spin S=1/2 perfect kagome antiferromagnet Ca-kapellasite [CaCu3(OH)6Cl2·0.6H2O] with a magnetic transition at T∗=7.2K. The static magnetic structure in the ground state has been determined to be a chirality-ordered Q=0 state, which is selected by a finite Dzyaloshinskii-Moriya interaction. The low-energy magnetic excitations in the ordered state are investigated by a nuclear spin-lattice relaxation rate measurement. We detect a weakly temperature-dependent contribution in the magnetic fluctuations perpendicular to the kagome plane in addition to the dispersive spin-wave contribution in the kagome plane. The low-energy magnetic excitations from the coplanar spin structure are attributed to the zero mode originating from the flat band in this kagome antiferromagnet.
AB - We present a Cl35 NMR study for the spin S=1/2 perfect kagome antiferromagnet Ca-kapellasite [CaCu3(OH)6Cl2·0.6H2O] with a magnetic transition at T∗=7.2K. The static magnetic structure in the ground state has been determined to be a chirality-ordered Q=0 state, which is selected by a finite Dzyaloshinskii-Moriya interaction. The low-energy magnetic excitations in the ordered state are investigated by a nuclear spin-lattice relaxation rate measurement. We detect a weakly temperature-dependent contribution in the magnetic fluctuations perpendicular to the kagome plane in addition to the dispersive spin-wave contribution in the kagome plane. The low-energy magnetic excitations from the coplanar spin structure are attributed to the zero mode originating from the flat band in this kagome antiferromagnet.
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U2 - 10.1103/PhysRevResearch.2.023269
DO - 10.1103/PhysRevResearch.2.023269
M3 - Article
AN - SCOPUS:85091133061
VL - 2
JO - Physical Review Research
JF - Physical Review Research
SN - 2643-1564
IS - 2
M1 - 023269
ER -